The unique properties of flowering plants, or angiosperms, include flowers, stamens, the male and female gametophyte, closed carpel, and endosperm. The flower, which contains the reproductive organs of the plant, is the major distinguishing characteristic of the angiosperm.Continue Reading
In addition to containing the reproductive organs of the plant, the flower also contains other unique properties. For instance, the flower holds the stamens that contain two pairs of pollen sacs. Within these pollen sacs is the male gametophyte used to fertilize the female gametophyte. The female gametophyte is located in the ovule of the flower, which is enclosed in the carpel.
Once pollen reaches the pistil of the flower, it attaches to the side and grows down the stigma and style to the ovary where the ovule is located. At this point, another sperm cell from the pollen grain fertilizes the egg cell. This unique property among angiosperms is called double fertilization. As the ovary grows into a fruit, with the ovule as a seed inside that fruit, endosperm within the ovary grows as well. This serves as the food source for the fertilized cell.
Angiosperms have only existed for the last 132 million years. However, it is the evolution and diversity of these plants that make them the most widespread plants. They are also necessary to humans for both food and clothing.Learn more about Outdoor Plants & Flowers